Arithmetic processing device

An arithmetic processing device comprising:

• a key input unit including a predetermined key and numeric keys;
• a menu displaying unit which displays a menu screen for a plurality of arithmetic processings when the predetermined key is operated, each arithmetic processings being allocated to each numeric keys;
• an arithmetic processing unit which, when a numeric key allocated to any one of the arithmetic processings is operated during a display of the menu screen, executes an arithmetic processing corresponding to the operated key;
• and
• a display controller which, when a key other than the numeric keys allocated to the arithmetic processings is operated during a display of the menu screen, displays a specific mark.

An arithmetic processing device for carrying out a calculation in accordance with an operation of a key input unit, where numeric keys are respectively allocated to a plurality of arithmetic processings, and for displaying a calculation result, the arithmetic processing device comprising:

• a determination unit which determines whether or not a key operated subsequent to an operation of a predetermined key is a numeric key allocated to any one of the arithmetic processings;
• an arithmetic processing unit which, when the determination unit determines that the key operated subsequent to the operation of the predetermined key is the numeric key allocated to any one of the arithmetic processings, executes an arithmetic processing corresponding to the operated numeric key;
• and
• a display controller which, when the determination unit determines that the key operated subsequent to the operation of the predetermined key is not the numeric key allocated to any one of the arithmetic processings, displays a specific mark.

A display control method for an arithmetic processing device for carrying out a calculation in accordance with an operation of a key input unit, where numeric keys are respectively allocated to a plurality of arithmetic processings, and for displaying a calculation result, the display control method comprising:

• determining whether or not a key operated subsequent to an operation of a predetermined key is a numeric key allocated to any one of the arithmetic processings;
• when it is determined that the key operated subsequent to the operation of the predetermined key is the numeric key allocated to any one of the arithmetic processings, executing an arithmetic processing corresponding to the operated numeric key;
• and
• when it is determined that the key operated subsequent to the operation of the predetermined key is not the numeric key allocated to any one of the arithmetic processings, displaying a specific mark.